JE Pistons 321321 Piston Set, 2618, Inv Dome/dish, 3.957 Bore, 1.535 Cd, 1.024 Pin, Set Of 6.

JE Pistons 321321 is a complete six-cylinder forged piston kit engineered for high-performance and racing applications. Constructed from 2618 low-silicon aluminum alloy, these pistons deliver the high tensile strength required for demanding, high-load engine builds. The inverted dome/dish crown design yields an 8.50:1 compression ratio, making this set well-suited for forced induction, nitrous, or high-output naturally aspirated builds.

Key Specifications:

• Alloy: 2618 forged aluminum
• Bore Diameter: 3.957 in. (100.50 mm)
• Compression Height (CD): 1.535 in.
• Pin Diameter: 1.024 in. (26 mm)
• Crown Design: Inverted Dome / Dish
• Compression Ratio: 8.50:1
• Dish Volume: -18.00 cc
• Cylinder Count: 6 (complete set)
• Piston Weight: Approx. 462 grams each

Key Features:

• Forged & Machined in the USA — engineered, forged, and CNC-machined domestically for consistent quality and tight tolerances
• Proprietary Forged Side Relief (FSR) Design — reduces skirt width to minimize friction and power loss while saving weight with a shorter wrist pin
• Accumulator Groove — manages combustion gas pressure to reduce ring flutter and improve ring seal for consistent power delivery
• Skirt Coating — reduces friction, wear, and operating noise for extended service life
• 23-Point Quality Inspection — inspected in an environmentally controlled lab to guarantee dimensional conformity
• Complete Kit — includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings

JE Pro Seal Piston Rings, included with every set, feature barrel-faced top rings made from premium ductile iron with plasma-moly inlays, drawing on decades of racing ring technology proven in NASCAR, NHRA, ALMS, and AMA competition.

With over 75 years of experience designing and manufacturing forged racing pistons, JE Pistons is a trusted name among professional engine builders and high-performance enthusiasts worldwide. Each piston in this set is individually serialized and tracked, ensuring your kit is ready to install straight out of the box.